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Years ago, perhaps 20 or more, I read a novel dealing with short distance time travel and micro-black holes. My memory seems to say it was written by James P. Hogan. But I've searched all his novels and haven't found it.

I read this about the same time as I was reading The Genesis Machine. There were two characters that were involved in testing time travel or events that took place only a few minutes apart, maybe even a few seconds.

The micro-black holes were theorized to penetrate the earth without doing much, if any, damage.

Somehow, perhaps because of relativistic effects, time was altered just enough that events that took place a few seconds earlier were made apparent in the present.

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Since you say you're thinking Hogan, I have to note that the first part of the question sounds a lot like Thrice Upon a Time.

The protagonist's uncle has developed an extremely limited form of time travel that allows him to send a message back in time 24 hours, no more. The micro black holes are an unexpected product of a nearby fusion power plant, but instead of passing harmlessly through the Earth, they threaten to destroy it.

I don't recall relativity coming into it, but the increasing radiation leakage from the black holes was making it harder and harder to send the necessary information back in time to save the world.

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  • This is the answer. As I read Jim's post I could remember reading the book myself and could remember the cover showing a man at a computer in a castle dungeon or some such. That was confirmed when I visited the link you provided. I used to own that book... I wonder where it went?
    – JBH
    Mar 15 at 6:47
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    @JBH interesting that that you say " wonder where it went?" - I owned this book twice back in the 80s, lost it both times before finishing it.
    – Organic Marble
    Mar 15 at 15:51
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    @OrganicMarble I once discovered I had 3 copies of the Haldemans' There Is No Darkness. My collection was a bit... disorganised.
    – DavidW
    Mar 15 at 15:57
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    It's a time travel book...have you guys considered it might have disappeared into the past? I mean, it knows how.
    – Cristobol Polychronopolis
    Mar 15 at 19:00
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    @CristobolPolychronopolis I should probably buy it once more, given the title.
    – Organic Marble
    Mar 15 at 22:24
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Space Chantey by R A Lafferty features very short distance time travel: the protagonist wins a fortune at the casino by going back 30 seconds or so every time he loses a bet.

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  • Are there micro black holes in that novel?
    – PM 2Ring
    Mar 16 at 6:26
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    @PM2Ring I didn't notice any: perhaps they were too small;-)
    – Simon Crase
    Mar 16 at 20:13

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